How often should engine oil be changed at the longest interval?

[Bustamante]

Engine oil should be changed at intervals between 5,000-10,000 kilometers or every six months to a year. Below is an introduction to the functions of engine oil: 1. Engine oil, also known as engine lubricant, serves to lubricate and reduce friction in the engine, assist in cooling, seal against leaks, prevent rust and corrosion, and provide shock absorption. 2. Changing the oil on time not only extends the engine's lifespan but also effectively reduces the vehicle's fuel consumption. Additional information: If engine oil is not changed for a long time, as its lifespan deteriorates, its lubrication capability rapidly declines, preventing the engine from receiving proper lubrication and leading to abnormal wear. Meanwhile, metal particles cleaned out by the oil, unable to be expelled, accumulate inside the engine, generating large amounts of sludge from the dirt. The engine may also experience increased fuel consumption, reduced power, difficulty starting, abnormal vibrations, and poor operation.